More and more people are turning to online reviews from sites like Yelp.com. A favorable review from Yelp can make a business boom. But a negative review can draw blood. A negative review can wreck a business, or destroy a professional's reputation.

So Yelp reviews are a double-edged sword. And it looks like a new industry has arisen to deal with online slash jobs.

The Wong case made blog headlines back in November 2010, when a California appellate court dismissed Yelp.com from Wong's lawsuit. That court ruled Yelp had protection from Dr. Wong's lawsuit, because Yelp was publicizing information about mercury in dental amalgams--an issue of public interest.